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Loan Servicing, Mortgage Origination, and Loans Held for Sale (Tables) | 9 Months Ended
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Sep. 30, 2020
Loan Servicing, Mortgage Origination, and Loans Held for Sale |
Summary of changes in the fair value of MSRs and its offsetting hedge | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended |  | Nine Months Ended |
(Dollars in thousands) |  | September 30, 2020 |  | September 30, 2019 |  | September 30, 2020 |  | September 30, 2019 | ​
Increase (decrease) in fair value of MSRs | ​ | $ | 1,020 | ​ | $ | (2,294) | ​ | $ | (9,078) | ​ | $ | (7,218) | ​
Decay of MSRs | ​ |  | (2,391) | ​ |  | (1,312) | ​ |  | (5,590) | ​ |  | (3,341) | ​
Gain related to derivatives | ​ | ​ | 619 | ​ | ​ | 1,476 | ​ | ​ | 10,915 | ​ | ​ | 5,415 | ​
Net effect on statements of income | ​ | $ | (752) | ​ | $ | (2,130) | ​ | $ | (3,753) | ​ | $ | (5,144) | ​
Schedule of characteristics and sensitivity analysis of the MSR | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, | ​ | ​ | December 31, | ​ | ​ | September 30, |  | ​
(Dollars in thousands) |  | 2020 |  |  | 2019 |  |  | 2019 | ​ | ​
Composition of residential loans serviced for others | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Fixed-rate mortgage loans | ​ | ​ | 99.9 | % | ​ | ​ | 99.8 | % | ​ | ​ | 99.8 | % | ​
Adjustable-rate mortgage loans | ​ | ​ | 0.1 | % | ​ | ​ | 0.2 | % | ​ | ​ | 0.2 | % | ​
Total | ​ | ​ | 100.0 | % | ​ | ​ | 100.0 | % | ​ | ​ | 100.0 | % | ​
Weighted average life | ​ | ​ | 5.52 | years | ​ | ​ | 6.55 | years | ​ | ​ | 6.10 | years | ​
Constant Prepayment rate (CPR) | ​ | ​ | 14.3 | % | ​ | ​ | 10.3 | % | ​ | ​ | 11.4 | % | ​
Weighted average discount rate | ​ | ​ | 9.0 | % | ​ | ​ | 9.4 | % | ​ | ​ | 9.4 | % | ​
Effect on fair value due to change in interest rates | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
25 basis point increase | ​ | $ | 2,533 | ​ | ​ | $ | 2,477 | ​ | ​ | $ | 2,398 | ​ | ​
50 basis point increase | ​ | ​ | 5,178 | ​ | ​ | ​ | 4,452 | ​ | ​ |  | 4,390 | ​ | ​
25 basis point decrease | ​ | ​ | (2,400) | ​ | ​ | ​ | (2,938) | ​ | ​ |  | (2,862) | ​ | ​
50 basis point decrease | ​ | ​ | (3,665) | ​ | ​ | ​ | (6,228) | ​ | ​ |  | (5,999) | ​ | ​

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- Definition Tabular disclosure of changes in the fair value of Mortgage Servicing Rights (MSRs) and its offsetting hedge. + References No definition available. + Details
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- Definition Tabular disclosure related to composition of residential mortgages serviced for others, characteristics and sensitivity analysis of the mortgage servicing rights. + References No definition available. + Details
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